<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      div,
      p {
        border: solid;
        height: 200px;
        margin: 20px;
      }
    </style>
  </head>
  <body>
    <!-- <button id="btn">提交</button> -->
    <button onclick="console.log('hello click');">提交</button>
    <!-- <button onclick="function () {
      console.log('hello click)';
    };">提交</button> -->
    <script>
      // const btn = document.getElementById("btn");
      // 监听事件
      // btn.onclick = function () {
      //   console.log("hello click");
      // };
      // 通过事件调用，通过用户行为发送“信号”调用
      // btn.onclick();
    </script>
  </body>
</html>
